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【题目】Susan has the flu. She go to the doctor.

A. must B. has to C. can D. have to

【答案】B

【解析】句意:Susan得了流感,她不得不去看医生。must表示必须,这里是客观原因;have to表示必须,不得不,这里表示主观原因,主语是第三人称单数,这里have要变第三人称单数。根据题意,故选B。

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